Testing out the gist.

gistfile1.pde

PShape shapeOut;
Ellipse[] shapesOut;
int numShapesOut = 10;

float scaleSpeed = 10;
float createSpeed = .05;
float fact = 1.0;

float centerX;
float centerY;

float lastEvent = 0;
Ellipse e;

void setup() {
  size(800, 600);
  frameRate(32);
  smooth();


  centerX = width/2;
  centerY = height/2;
}

void draw() {
  background(.03);
  shapeMode(CENTER);
  translate(mouseX, mouseY);

  if (e == null && millis() - lastEvent >= 100) {
    e = new Ellipse(0, 0, 1, 1);
    lastEvent = millis();
  }

  if (e != null) {
    e.draw(color(249, 255, 127));
    e.setScale(e.getScale() + scaleSpeed);
    if (e.getScale() > 800) {
      e = null;
    }
  }
}